Archived posting to the Leica Users Group, 2011/12/30

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Subject: [Leica] M9 DNG compression
From: steve.barbour at gmail.com (Steve Barbour)
Date: Fri, 30 Dec 2011 10:00:08 -0800
References: <p06240807cb227842f4d7@[192.168.1.101]> <002a01ccc66a$2e0738c0$8a15aa40$@chiaroscuro.co.nz> <0575E4AC-D5E1-4B15-BDE6-6E33E3DE6C50@archiphoto.com>

On Dec 29, 2011, at 1:53 PM, Henning Wulff wrote:

> I too have never seen a difference to date. Early on I shot a number of 
> comparisons to make sure I wasn't doing something stoopid, but as a result 
> of those tests and information from Leica I now shoot compressed. It's not 
> a matter of disk space or card space, but of speed. The buffer in the M9 
> is small enough, and clears slowly enough that any speed enhancement is 
> noticeable, and there is a BIG difference in the speed. Try shooting a 
> buffer full of compressed vs. non-compressed images and see how long it 
> takes for the buffer to clear (write light to stop blinking).
> 
> I don't shoot in continuous mode, but I do expect the camera to be ready 
> when the shot arrives in the viewfinder. When the buffer is full, the shot 
> is often gone by the time the camera is ready again.


thanks Henning, for these reasons I just switched my M9 to "compressed",



Steve



> 
> Henning
> 
> 
> On 2011-12-29, at 12:41 PM, John McMaster wrote:
> 
>> I don't think any real difference has been seen at this stage. The main
>> thing is whether future software can bring more information out of a DNG
>> file which may be lost if compressed. I shoot uncompressed and deal with 
>> the
>> data ;-)
>> 
>> john
>> 
>> -----Original Message-----
>> 
>> 
>> Has anyone ever done a comparison of the 34.6 Mb Leica DNGs to the
>> compressed versions which are 18 Mb more or less depending on the degree 
>> of
>> detail in the image? While it is not an issue for me, with a mere 1000 to
>> 2000 images per year, terabyte drives being so cheap, It probably is an
>> issue to the much more prolific professional photographers.
>> 
>> The question is: has anyone ever found an image where this degree of
>> compression has been seen to matter?
>> 
>> Herb
>> 
>> 
>> 
>> _______________________________________________
>> Leica Users Group.
>> See http://leica-users.org/mailman/listinfo/lug for more information
>> 
> 
> 
> Henning Wulff
> henningw at archiphoto.com
> 
> 
> 
> 
> 
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information



In reply to: Message from kanner at acm.org (Herbert Kanner) ([Leica] M9 DNG compression)
Message from john at chiaroscuro.co.nz (John McMaster) ([Leica] M9 DNG compression)
Message from henningw at archiphoto.com (Henning Wulff) ([Leica] M9 DNG compression)